import math
def compute_area_of_circle(r):
       return round(math.pi * r ** 2, 2)

print("area of 2 is: ", compute_area_of_circle(2))
print("area of 3.14 is: ", compute_area_of_circle(3.14))
print("area of 6.28 is: ", compute_area_of_circle(6.28))